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|
{-# LANGUAGE DeriveDataTypeable #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Util.Replace
-- Copyright : (c) Jan Vornberger 2009
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : Adam Vogt <vogt.adam@gmail.com>
-- Stability : unstable
-- Portability : unportable
--
-- Implements a @--replace@ behavior outside of core.
--
-----------------------------------------------------------------------------
-- refer to core patches:
-- http://article.gmane.org/gmane.comp.lang.haskell.xmonad/8358
module XMonad.Util.Replace
( -- * Usage
-- $usage
replace
-- * Notes
-- $shortcomings
-- ** Implementing a @--replace@ flag
-- $getArgs
) where
import XMonad
import Data.Function
import Control.Monad
-- $usage
-- You must run the 'replace' action before starting xmonad proper, this
-- results in xmonad replacing the currently running WM regardless of the
-- arguments it is run with:
--
-- > import XMonad
-- > import XMonad.Util.Replace
-- > main = do
-- > replace
-- > xmonad $ def { .... }
--
-- $shortcomings
-- This doesn't seem to work for replacing WMs that have been started
-- from within xmonad, such as with @'restart' "openbox" False@, but no other
-- WMs that implements --replace manage this either. 'replace' works for
-- replacing metacity when the full gnome-session is started at least.
-- $getArgs
-- You can use 'System.Environment.getArgs' to watch for an explicit
-- @--replace@ flag:
--
-- > import XMonad
-- > import XMonad.Util.Replace (replace)
-- > import Control.Monad (when)
-- > import System.Environment (getArgs)
-- >
-- > main = do
-- > args <- getArgs
-- > when ("--replace" `elem` args) replace
-- > xmonad $ def { .... }
--
--
-- Note that your @~\/.xmonad/xmonad-$arch-$os@ binary is not run with the same
-- flags as the @xmonad@ binary that calls it. You may be able to work around
-- this by running your @~\/.xmonad/xmonad-$arch-$os@ binary directly, which is
-- otherwise not recommended.
-- | @replace@ must be run before xmonad starts to signals to compliant window
-- managers that they must exit and let xmonad take over.
replace :: IO ()
replace = do
dpy <- openDisplay ""
let dflt = defaultScreen dpy
rootw <- rootWindow dpy dflt
-- check for other WM
wmSnAtom <- internAtom dpy ("WM_S" ++ (show dflt)) False
currentWmSnOwner <- xGetSelectionOwner dpy wmSnAtom
when (currentWmSnOwner /= 0) $ do
putStrLn $ "Screen " ++ (show dflt) ++ " on display \""
++ (displayString dpy) ++ "\" already has a window manager."
-- prepare to receive destroyNotify for old WM
selectInput dpy currentWmSnOwner structureNotifyMask
-- create off-screen window
netWmSnOwner <- allocaSetWindowAttributes $ \attributes -> do
set_override_redirect attributes True
set_event_mask attributes propertyChangeMask
let screen = defaultScreenOfDisplay dpy
let visual = defaultVisualOfScreen screen
let attrmask = cWOverrideRedirect .|. cWEventMask
createWindow dpy rootw (-100) (-100) 1 1 0 copyFromParent copyFromParent visual attrmask attributes
-- try to acquire wmSnAtom, this should signal the old WM to terminate
putStrLn $ "Replacing existing window manager..."
xSetSelectionOwner dpy wmSnAtom netWmSnOwner currentTime
-- SKIPPED: check if we acquired the selection
-- SKIPPED: send client message indicating that we are now the WM
-- wait for old WM to go away
putStr $ "Waiting for other window manager to terminate... "
fix $ \again -> do
evt <- allocaXEvent $ \event -> do
windowEvent dpy currentWmSnOwner structureNotifyMask event
get_EventType event
when (evt /= destroyNotify) again
putStrLn $ "done"
closeDisplay dpy
|
